| 摘要: |
| 设计了模拟自然环境的混凝土加速寿命试验，测试了试件的动弹性模量、质量和超声声速，并对其相对质量及相对动弹性模量变化规律进行了研究；结合混凝土试件寿命数据，采用Wiener过程对其动弹性模量的耐久性退化趋势建模，得到了剩余寿命可靠度函数.结果表明：模拟自然环境的加速寿命试验更接近混凝土结构在实际条件下的服役过程；以相对动弹性模量作为耐久性评价参数，与相对质量评价参数相比，其对环境因素的影响更为敏感；在混凝土劣化过程中，以盐冻循环破坏为主，其他破坏为辅；Wiener随机过程可有效描述混凝土的耐久性退化规律，基于收集的部分寿命数据，应用该方法建立的剩余寿命可靠度函数能直观反映其剩余寿命，且剩余寿命预测与试验结果一致. |
| 关键词: 混凝土 加速寿命试验 寿命预测 Wiener过程 可靠性 |
| DOI：10.3969/j.issn.1007 9629.2016.06.012 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51168031，51468039) |
|
| Accelerated Life Test of Concrete Based on Wiener Stochastic Process |
|
QIAO Hongxia, ZHU Binrong, LU Chenggong, FENG Qiong, ZHOU Mingru, CAO Hui
|
|
Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou 730050, China
|
| Abstract: |
| The accelerated life test of concrete was designed to stimulate the special natural environment. Its evaluation parameters, such as dynamic elastic modulus, mass and ultrasonic velocity were tested, and the variation of relative mass and relative dynamic elastic modulus of concrete was investigated. Based on the life date， the Wiener process for modeling the degradation process of the dynamic elastic modulus was used to obtain the reliability function of the remaining life. The results show that the accelerated life test for simulating natural environment is close to the service process of concrete structure under actual conditions. The relative dynamic elastic modulus can be used as the durability evaluation parameter and it is more sensitive to the environmental factors compared with the relative quality evaluation parameters. In the deterioration process of the concrete, the salt freezing cycle is the main role, and the other is the helping role. Wiener stochastic process can effectively describe the durability degradation law of concrete. Based on the part of the life data, by using this method, the remaining life reliability function can directly reflect the remaining life of the specimen, and the experimental value is in good agreement with the life time prediction. |
| Key words: concrete accelerated life test life prediction Wiener process reliability |
